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An effective strategy for small molecular solution-processable iridium(III) complexes with ambipolar characteristics: towards efficient electrophosphorescence and reduced efficiency roll-off
Cai, Jun-Xi1; Ye, Teng-Ling2; Fan, Xue-Feng1; Han, Chun-Miao1; Xu, Hui1; Wang, Li-Li1; Ma, Dong-Ge2; Lin, Yang1; Yan, Peng-Fei1
2011
Source PublicationJOURNAL OF MATERIALS CHEMISTRY
ISSN0959-9428
Volume21Issue:39Pages:15405-15416
AbstractA series of electrophosphorescent small molecular Ir(3+) complexes IrPBIO(2), IrPBICO, IrPBIO(4) and IrPBIC(2)O(2) for solution-processable host-free organic light-emitting diodes (OLEDs) were designed and synthesized, in which the electron-transporting 1,3,4-oxadiazole (OXD) and hole-transporting carbazole moieties were introduced through aliphatic chains to achieve balanced carrier injection/transporting. The coordinatable OXD groups were successfully and conveniently introduced through the post-substitution of Ir(3+) cores. The photophysical investigation showed that compared with the single-position substituted counterparts, the double-position substitution is superior in restraining the quenching effect in solid states to endow the corresponding complexes with the much higher photoluminescence quantum yield (PLQY) in the film. The influences of peripheral carrier transporting (CT) moieties on the energy levels of frontier molecular orbitals were investigated with UPS analysis and Density Function Theory calculation. The dramatic electroluminescent (EL) performance of IrPBIC(2)O(2) based on its host-free spin-coat phosphorescent organic light-emitting diodes (PHOLEDs), especially the remarkably restrained efficiency roll-off less than 16% at 1000 cd m(-2) was realized, which demonstrated that the combined modification of the effective segregation of emitting cores by multiposition encapsulation and the balanced carrier injection/transporting through bipolar substitution is an effective strategy for realizing high-efficiency small molecular electrophosphorescent materials with the features of solution processability and strong restraining effect on quenching for host-free devices.
DOI10.1039/c1jm12114f
Indexed BySCI
Language英语
WOS IDWOS:000295278000046
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:29[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/71944
Collection中国科学院化学研究所
Corresponding AuthorXu, Hui
Affiliation1.Heilongjiang Univ, Minist Educ, Key Lab Funct Inorgan Mat Chem, Harbin 150080, Peoples R China
2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Cai, Jun-Xi,Ye, Teng-Ling,Fan, Xue-Feng,et al. An effective strategy for small molecular solution-processable iridium(III) complexes with ambipolar characteristics: towards efficient electrophosphorescence and reduced efficiency roll-off[J]. JOURNAL OF MATERIALS CHEMISTRY,2011,21(39):15405-15416.
APA Cai, Jun-Xi.,Ye, Teng-Ling.,Fan, Xue-Feng.,Han, Chun-Miao.,Xu, Hui.,...&Yan, Peng-Fei.(2011).An effective strategy for small molecular solution-processable iridium(III) complexes with ambipolar characteristics: towards efficient electrophosphorescence and reduced efficiency roll-off.JOURNAL OF MATERIALS CHEMISTRY,21(39),15405-15416.
MLA Cai, Jun-Xi,et al."An effective strategy for small molecular solution-processable iridium(III) complexes with ambipolar characteristics: towards efficient electrophosphorescence and reduced efficiency roll-off".JOURNAL OF MATERIALS CHEMISTRY 21.39(2011):15405-15416.
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